Testing device



FIG. 1 is a front elevational view of the testing device;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left-side elevational view thereof;

FIG. 5 is a right-side elevational view thereof;

FIG. 6 is a front, top, right perspective view thereof; and,

FIG. 7 is a back, top, left perspective view thereof.

The evenly spaced broken lines depict unclaimed parts of the testing device and form no part of the claimed design. 

CLAIM The ornamental design for a testing device, as shown and described. 